This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 5 |
| 7 | 30 |
| 8 | 175 |
| 9 | 1120 |
| 10 | 7686 |
| 11 | 56910 |
| 12 | 452760 |
| 13 | 3858525 |
| 14 | 35101495 |
| 15 | 339725386 |
| 16 | 3487023540 |
| 17 | 37846867240 |
| 18 | 433186049100 |
| 19 | 5215583431800 |
| 20 | 65904645333720 |
| 21 | 872154648378075 |
| 22 | 12063864339947700 |
| 23 | 174104719888432025 |
| 24 | 2617216790440934220 |
| 25 | 40916672402313971340 |